So I recently used a #sledgehammer where a #scalpel was needed.
I've got an #HP DL80 Gen9 with the iLO license, but without the #FlexibleLOM card... so to access the iLO I have to have an ethernet cable plugged into the first ethernet port.
Problem is, no matter what I tried in #Webmin or #NetworkManager, every reboot would re-enable that port... which would then get a IP via DHCP (even when I'd disabled it in nm...), which would mean #Zabbix would pick it up as a client and add it.. meaning every time a disk got a little "backed up", I'd get two alerts, and this machine has 12 very old SATA drives in it.
Tired of messing with the damned thing, I finally got out the sledgehammer....
....and blacklisted HP's #OUI from the #DHCP server.
No IP, no extra client created in Zabbix, and only the normally-annoying amount of alerts.
I'll #fsck with it for real, later...